PSYC 3800 Lecture 4: Chapter 25 - Molecular Memory (Invertebrate) - 3-pages
Document Summary
Examining the molecular mechanisms of learning and memory in invertebrate and mammalian nervous systems. Identifying where and how different types of information are stored. Physical modification of brain caused by incoming sensory information. Implicit memory in the simple system aplysia californicus: non-associative, associative. Stimulation of the siphon will lead to a withdrawal of the gill. Signal from the stimulation of the siphon enters the abdominal ganglion. One of the motor neurons, l7 responsible for the gill withdrawal reflex. At the synapse between sensory nerve and muscle. After habituation- fewer quanta released in response to the action potential. Reduced quantal release due to decrease in ca2+ entry into presynaptic neuron. Four separated sessions = up to 3 weeks habituation. Decrease in the number of synaptic connections between sensory and motor neurons: sensitization of the. If an animal encounters a harmful stimulus, fear becomes a learned response. Defensive mechanism is to increase withdrawal or escape responses.
